injector question

[cumminsdiesel_2]

has anybody ever heard of a bad injector blowing out a head gasket on a arp 625 studed 5.9l common rail

 

[TCDiesel]

NO....burn down the piston, but blown HG ,Not likely.

 

[Big Swole]

Has the head ever been off of it before?

If so, was it decked?

Anything else we need to know?

 

[cumminsdiesel_2]

it was decked and running an mls head gasket aroung 80psi 85 lph injectors

 

[Big Swole]

-What are they torqued to?
-Did you cycle them like the instuctions say?
-Did you do any type of a re-torque (cold or warm) after an initial run or drive without beating on it?
-Was the block checked for flatness?

 

[cumminsdiesel_2]

the engine is built up and has head work do to it we re torque the studs after one heat cycle they are torque to 150 ft/lbs so it was checked for flatness

 

[Big Swole]

Hmmm.

I'm not sure what to say then if all the bases were covered...

80 psi is not too much, I've heard of way more without blowing...

Only thing I can say is give it another shot...Do all the same that you did before to insure a good seal...If you have another issue the same way and in the same area, you may want to double check the head and block decks...

I sure hope it was just a fluke thing for ya, cause I know what a PITA it is to work on these things all the time!!

Good luck man!!

 

[cumminsdiesel_2]

thanks for your help, i just wonder if i should have re torque the studs atleast one more time

 

[Big Swole]

thanks for your help, i just wonder if i should have re torque the studs atleast one more time

Ive got the same mls HG and 625's.....I only did one re-torque after one heat cycle, but it was a warm torque....

But my fueling is less than yours (Flux 3.8's - 190's) and my boost rarely goes over 65-70.....I'm decompressed a bit...

Maybe just try a warm torque after a couple of good 150 ft. lb. cold torques...

Good luck

 

[cumminsdiesel_2]

big swole have you ever heard of detination in a diesel caused buy a bad injector

 

[Big Swole]

big swole have you ever heard of detination in a diesel caused buy a bad injector

Well, describe what your talking about a bit better....

Are you talking about the "Rattle" or "Clattering" sound at Low Boost / Low rpm situations? My truck has always had it....annoying as Hell!!

Some trucks have it and some don't....Weird....
But never cause any HG issues with my truck or others that I know of...

My injectors have been tested so many times as "good" that it isn't ness. an injector problem..

Is this what your referring too?

 

[cumminsdiesel_2]

someone was saying that if you have a bad injector you can fill the cylinder with fuel and before the fuel burns off it fills it agian and thats what causes the head gasket to go

 

[SuperiorRam]

Are you piss pounding it before it gets up to operating temp?

 

[cumminsdiesel_2]

always let it get to operating temp before i get on it

 

[SuperiorRam]

Figured Id ask...